Debian DLA-2087-1 : suricata security update

critical Nessus Plugin ID 133363

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Synopsis

The remote Debian host is missing a security update.

Description

Two vulnerabilities have recently been discovered in the stream-tcp code of the intrusion detection and prevention tool Suricata.

CVE-2019-18625

It was possible to bypass/evade any tcp based signature by faking a closed TCP session using an evil server. After the TCP SYN packet, it was possible to inject a RST ACK and a FIN ACK packet with a bad TCP Timestamp option. The client would have ignored the RST ACK and the FIN ACK packets because of the bad TCP Timestamp option.

CVE-2019-18792

It was possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet had to be injected just before the PUSH ACK packet we wanted to bypass. The PUSH ACK packet (containing the data) would have been ignored by Suricata because it would have overlapped the FIN packet (the sequence and ack number are identical in the two packets). The client would have ignored the fake FIN packet because the ACK flag would not have been set.

For Debian 8 'Jessie', these problems have been fixed in version 2.0.7-2+deb8u5.

We recommend that you upgrade your suricata packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected suricata package.

Plugin Details

Severity: Critical

ID: 133363

File Name: debian_DLA-2087.nasl

Version: 1.5

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 1/31/2020

Updated: 3/28/2024

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS Score Source: CVE-2019-18792

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:suricata, cpe:/o:debian:debian_linux:8.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/30/2020

Vulnerability Publication Date: 1/6/2020

Reference Information

CVE: CVE-2019-18625, CVE-2019-18792

Detections

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